The Guernsey side were very much in the game until running out of steam in the last quarter and went down 40-17.
They clawed their way to just two adrift at 17-19 at half-time and were just 10 points down with 18 minutes left.
The Guernsey tries, both converted by Owen Thomas, were scored by Joe Andresen and Matt Armstrong.
Thomas also landed a penalty and briefly thought he had gone over for a try of his own, only to be denied by an eagle-eyed touch judge who spotted his foot on the line.
Raiders have a chance to get their promotion bid back on track with a home game against whipping boys Westcliff next Saturday.
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